Abstract
Abstract. The full-waveform data is the core data of GaoFen-7 (GF-7) satellite laser altimeter, and evaluation of waveform data quality is an important step and premise for satellite laser altimetry and quality control. In this paper, the full waveform data quality assessment and analysis of GF-7 laser altimeter is implemented during the period of on-orbit experiment, and the real waveform data of many orbits is used to quantitatively describe the characteristic parameters of the transmitted waveform and the signal-to-noise ratio (SNR), and the result of two beam lasers is compared. The conclusion is validated that the GF-7 laser altimeter can obtain effective waveform data and the echo waveform availability of the experimental data is approximate 72.59%, moreover, the quality of beam 1 is slightly better than that of the beam 2. The laser temperature is an important indication of the quality of transmitted waveform according to the SNR changing. The good SNR value of the waveform and small footprint size will be helpful for the terrain information extraction and analysis, although the repetition frequency is low.
Highlights
As an active remote sensing, laser altimeter has been concerned to load on the satellite to obtain the high precision elevation information (Tang et al, 2017)
Where the Imax is maximum value of the waveform intensity, and mN is the mean value of background noise, σN is the standard deviation of the waveform noise
The signal-to-noise ratio (SNR) of the received waveform is affected by the terrain features, such as clouds, trees and vegetation, and the maximum of SNR of received waveform is 27.993, and the minimum value is 18.865, which shows a good reliability of the received waveform even it has the lower SNR. 5) The temperature of the APD will affect the quality of the transmitted waveform data, which can be used as an indicator to evaluate the state of the laser
Summary
As an active remote sensing, laser altimeter has been concerned to load on the satellite to obtain the high precision elevation information (Tang et al, 2017). It was mainly used to test the function and performance of the laser altimeter, and has provided important reference for the laser altimetry satellites it did not record the full-waveform data. Along with high resolution stereo cameras, a two-beam laser altimeter with full waveform sampling and recording function is equipped on the GF-7 to obtain high accuracy elevation control points.
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